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  <section id="cmp0067">
<span id="policy:CMP0067"></span><h1>CMP0067<a class="headerlink" href="#cmp0067" title="Link to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.8.</span></p>
</div>
<p>Honor language standard in <span class="target" id="index-0-command:try_compile"></span><a class="reference internal" href="../command/try_compile.html#command:try_compile" title="try_compile"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_compile()</span></code></a> source-file signature.</p>
<p>The <span class="target" id="index-1-command:try_compile"></span><a class="reference internal" href="../command/try_compile.html#command:try_compile" title="try_compile"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_compile()</span></code></a> source file signature is intended to allow
callers to check whether they will be able to compile a given source file
with the current toolchain.  In order to match compiler behavior, any
language standard mode should match.  However, CMake 3.7 and below did not
do this.  CMake 3.8 and above prefer to honor the language standard settings
for <code class="docutils literal notranslate"><span class="pre">C</span></code>, <code class="docutils literal notranslate"><span class="pre">CXX</span></code> (C++), and <code class="docutils literal notranslate"><span class="pre">CUDA</span></code> using the values of the variables:</p>
<ul class="simple">
<li><p><span class="target" id="index-0-variable:CMAKE_C_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_C_STANDARD.html#variable:CMAKE_C_STANDARD" title="CMAKE_C_STANDARD"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_STANDARD</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_C_STANDARD_REQUIRED"></span><a class="reference internal" href="../variable/CMAKE_C_STANDARD_REQUIRED.html#variable:CMAKE_C_STANDARD_REQUIRED" title="CMAKE_C_STANDARD_REQUIRED"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_STANDARD_REQUIRED</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_C_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_C_EXTENSIONS.html#variable:CMAKE_C_EXTENSIONS" title="CMAKE_C_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_EXTENSIONS</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_CXX_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_CXX_STANDARD.html#variable:CMAKE_CXX_STANDARD" title="CMAKE_CXX_STANDARD"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_STANDARD</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_CXX_STANDARD_REQUIRED"></span><a class="reference internal" href="../variable/CMAKE_CXX_STANDARD_REQUIRED.html#variable:CMAKE_CXX_STANDARD_REQUIRED" title="CMAKE_CXX_STANDARD_REQUIRED"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_STANDARD_REQUIRED</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_CXX_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_CXX_EXTENSIONS.html#variable:CMAKE_CXX_EXTENSIONS" title="CMAKE_CXX_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_EXTENSIONS</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_CUDA_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_CUDA_STANDARD.html#variable:CMAKE_CUDA_STANDARD" title="CMAKE_CUDA_STANDARD"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CUDA_STANDARD</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_CUDA_STANDARD_REQUIRED"></span><a class="reference internal" href="../variable/CMAKE_CUDA_STANDARD_REQUIRED.html#variable:CMAKE_CUDA_STANDARD_REQUIRED" title="CMAKE_CUDA_STANDARD_REQUIRED"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CUDA_STANDARD_REQUIRED</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_CUDA_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_CUDA_EXTENSIONS.html#variable:CMAKE_CUDA_EXTENSIONS" title="CMAKE_CUDA_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CUDA_EXTENSIONS</span></code></a></p></li>
</ul>
<p>This policy provides compatibility for projects that do not expect
the language standard settings to be used automatically.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of this policy is to ignore language standard
setting variables when generating the <code class="docutils literal notranslate"><span class="pre">try_compile</span></code> test project.
The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior of this policy is to honor language standard
setting variables.</p>
<p>This policy was introduced in CMake version 3.8.
It may be set by <span class="target" id="index-0-command:cmake_policy"></span><a class="reference internal" href="../command/cmake_policy.html#command:cmake_policy" title="cmake_policy"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_policy()</span></code></a> or <span class="target" id="index-0-command:cmake_minimum_required"></span><a class="reference internal" href="../command/cmake_minimum_required.html#command:cmake_minimum_required" title="cmake_minimum_required"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_minimum_required()</span></code></a>.
If it is not set, CMake does <em>not</em> warn by default, and uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior.</p>
<p>See documentation of the
<span class="target" id="index-0-variable:CMAKE_POLICY_WARNING_CMP&lt;NNNN&gt;"></span><a class="reference internal" href="../variable/CMAKE_POLICY_WARNING_CMPNNNN.html#variable:CMAKE_POLICY_WARNING_CMP&lt;NNNN&gt;" title="CMAKE_POLICY_WARNING_CMP&lt;NNNN&gt;"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_POLICY_WARNING_CMP0067</span></code></a>
variable to control the warning.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of a policy is
<span class="target" id="index-0-manual:cmake-policies(7)"></span><a class="reference internal" href="../manual/cmake-policies.7.html#manual:cmake-policies(7)" title="cmake-policies(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">deprecated</span> <span class="pre">by</span> <span class="pre">definition</span></code></a>
and may be removed in a future version of CMake.</p>
</div>
</section>


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